Screen chute



July 19,1938.

' A. SMITH ET. AL

SCREEN CHUTE Filed Aug. 19, 1955 2 Sheets-Sheet l [N VE/V ToRs:

Hrch/bo/o L 5/77/77),

July 19, 1938.

A. L. SMITH ET AL SCREEN CHUTE Filed Aug. 19, 1935 2 Shegts-Sheet 2Patented July 19, 1938 r UNITED STATES PATENT OFFICE SCREEN CHUTEArchibald L. Smith and Francis E. McGovern, Columbus; Ohio, assignors toThe Jefirey Manufacturing Company, a. corporation of Ohio ApplicationAugust 19, 1935, Serial No.36,817

10 Claims. (01. 209-399)' This invention relates to screen chutes, parbedirected by the valve I1 .into the discharge ticularly of the typeadapted to be employed to chute I and to the guide spout I6, by whichscreen coal to size as employed in a coal tipple. they may be guidedinto a car in a manner well An object of the invention is to provide aknown to those familiar with tipple practice. 5 chute having a screenmade up of removable sec- By closing the gate valve I1, the materialtions which are simple and rugged in construcpassing through the screenI3 forward thereof tion, which screen sections may be readily remay bepassed on down the chute l8 and released moved and replaced by othersections having difwith material which passesthrough the screen ferentsize screen openings therein. I3 below said gate valve II. In generalpractice,

Another object of the invention is to provide the screen sections I4 ofthe screen I3, which a chute in which removable screen sections of arepositioned above the gate valve II, will have widely varying lengths maybe employed. relatively small openings therein whereby only Otherobjects of the invention will appear relatively fine material will passtherethrough.

hereinafter, the novel features and combinations The screen sections I4,positioned below the being set forth in the appended claims. gate valveII, will have larger openings therein 1 In the accompanying drawings:whereby larger size coal particles may pass there- Fig. 1 is a sideelevational view of a screen through. Any number of screen sections withchute comprising my invention; different size openings may be providedto screen Fig. 2 is an end sectional view taken on the selectively andprogressively the material which line 2--2 of Fig. 1; passes down saidscreen I3.

Fig. 3 is an enlarged side view showing the One of the principalfeatures of our invention mounting of a screen section; resides in theconstruction of the screen sections Fig. 4 is a perspective view of ascreen section; I4 and the co-operating supporting means there- Fig. 5is a side elevational view of a shaker for, whereby said screen sectionsI4 may be type of screen chute comprising my invention; readily removedto the end that screen sections 2 Fig. 6 is an enlarged detail side viewof a porhaving different size perforations may be substition of thechute of Fig. 5 showing particularl tuted therefor, thereby providing aready conthe mounting of the screen sections; trol of the size ofmaterial received by the chute Fig. 7 is a sectional end view on theline I5.

1-1 of Fig. 6;

Fig. 8 is a side view of a portion of the screen the chute I8 comprisesthe side walls I8, I8 and a chute showing the construction of a lip typeof closed or imperforate bottom wall I9. The botscreen section; tom wallI9 is provided with an appropriate open- Fig. 9 is a sectional end viewof a modified ing leading to the auxiliary discharge chute I5, form ofscreen chute; and which opening is controlled by the gate valve I! Fig.10 is an enlarged side view showing a depivoted to shaft I1 and operableby hand lever tail of the device of Fig. 9. I8 to open-or closedposition where it may be Referring particularly to the drawings, therelocked to brackets I9 or 28', respectively, by a is seen a chute I 0which is adapted to receive removable bolt and nut. In the closedposition, material, such as coal, from a conveyor II, which the freeedge of valve rests on the ledge 2|. may be a belt conveyor, the coal.being directed Extending along a straight line longitudinally to thechute I0 by an auxiliary chute I2. The ,of the chute I8 and adjacent theside walls I8, I8, chute I8 is provided with a screen |3 which may thereextends a pair of spaced rails 28, 28, which be made up of a pluralityof screen sections I4, are rigidly attached to said side walls I8, I8 bywhich screen sections I4 are removably and interrivets 2|, 2|.Appropriate spacers 22, 22 are changeably carried in the chute I0.provided through which the shafts of the rivets Adjacent the bottom ofthe chute I8 may be 2|, 2| extend, whereby the rails 28, 28 will .be oneor more auxiliary discharge chutes I5 which spaced from said side wallsI8, I8 while being lead to a guide spout I6. An adjustable gateheldrigidly therewith.

valve I! may be provided to direct material which The construction ofthe screen sections I4 is passes through the screen I3 forward of thebest seen in Figs. 2, 3 and 4 of the drawings. discharge chute I5 intosaid discharge chute. Said sections comprise a perforate bottom plate Itwill thus be evident that as coal is fed to the 23 having adjacent eachside edge a longitudichute ID the particles thereof, which are ablenally and upwardly extending flange 24., 'Said to pass through theapertures of screen I3, may flanges 24 are provided to lendrigidity tothe Asbest seen in Figs. 1 and 2 of the drawings, P

Adjacent each corner, the bottom plate 23 is' provided with a downwardlyextending leg 26 which is notched at 2'! to receive the spacer 22 aboutrivet 2!. The longitudinal axis of the slot 21 preferably forms a slightangle to the vertical,

whereby said axis will be substantially vertical when positioned on thesloping chute I0.

As best seen in Fig. 3 of the drawings, theslot 21 is cut to such adepth that the metal adja cent the bottom portion thereof does notcontact 7 with a spacer 22. In other words, the bottom plate 23 willride on the rails 20 rather than permit the riding of the legs 26 on thespacers 22. This will insure a maximum bearing area for supporting thescreen sections 14 and will prevent unduewearing of spacers 22 or slots2! in legs 26. It will be evident that the function of the slotted legs26 is to position and holdscreen sections 14 in the chute l9.

' It is to be noted that the rivets 2| are equally spaced along thechute l9 whereby screen sections M of different lengths may be employedin which the distance between the slots 21 is a multiple of the distancebetween the axes of adjacent rivets 2|. That is, a screen section 14 mayhave any desired length, the only requirement being that the legs 26 beso positioned that the slots 21 are spaced a distance which is amultiple of the distance between the axes of adjacent rivets 2!. Thispermits any screen section to be used in any trough made to thesestandards.

It is thus evident that a device is provided in which a screen l3 may bemade up of a variable number of screen sections I4, which screensections l4 may be readily removed and replaced either for the purposeof varying the effective size of the openings in the complete screen l3or for any other purpose.

As is seen from Fig. 1 of the drawings, there is preferably positionedabove the opening which leads to auxiliary discharge chute l5 a sectionof the screen l3 which is not perforated This section is indicated at 23and forms a dividing point in the screen l3 between the portion which isadapted to feed the auxiliary dischargechute l5 and the portion whichfeeds a subsequent, similar chute. 7

Reviewing briefly the mode of operation of our invention of Fig. 1, coalwill be fed to the chute from the conveyor 1 l. The screen I 3 will havesections [4 with relatively small openings therein extendingto the plate28. Relatively fine coal will thus pass through theupper portion of thescreen l3 and may be directed by gate valve I! to the auxiliarydischarge chute l5, from which it is received by the guide spout l6 andloaded onto a car. The subsequent screen sections I4 of the screen I 3below the plate 28 may have largesize openings to effect a furtherscreening operation on the coal. The size of the openings in the. screenl3 may be effectively varied, as desired, by removing the sections l4and substituting other sections having different size openings in thebottom plates 23 thereof.

In Fig. we have shown a modified form of our inventionincorporating ashaking screen 30 having a pair of spaced side plates 3| connectedtogether by a transversely extending bottom plate 32 to form a trough.The shaking screen 30 is suspended on framework 33 by appropriatepivoted hangers 36 which allow vibratory movement of said shaking screen39 with respect to said framework 33. Vibratory movement of said shakingscreen 39 is provided by an eccentric mechanism 35 which may be'driven'froi'n a motor 33 by any appropriate driving means, such as belt31.

1 A plurality of screen sections 38 is provided which may be of thegeneral structure of the screen sections M illustrated in Fig. 4 exceptfor such differences as will be hereinafter specifically pointed out.Said screen sections 38 differ from said screen sections i in that inplace of the downwardly extending legs we provide downwardly extendingpins 39 having frusto-conical points 33.

As best seen in Fig. 5 of the drawingsthe axis of the pins 39 make anacute angle with the plane of the screen sections 38and are preferably.substantially vertical. This construction tends to insure againstdisplacement of the screen sections 38 with respect to the shakingscreen 30. We also contemplate a structure in which the axis of the pins39 is at right angles to the plane of the screen section'38.

For supporting the screen sections 38 in the shaking screen 39, weprovide a plurality of longitudinally extending angle members 4!, onead-. jaccnt each side plate 3|, the vertical flanges of which arerigidly attached to said plates 3|, as by welding. Said angle members 4|are provided with apertures 42 to receive the pins 39. Due to the factthat the pins 39 extend through said apertures at an acute angle to thetop web of the angle members M, the apertures 42 are slightly largerthan the pins 39. -This construction would result in some looseness ofthe screen sec tions 38 on the angle members 4| which would result inundue wear of the pins 39. To provide a closer fit for the pins 39 toprevent relative movement between said screen sections 38 and theshaking screen 39, we provide a plurality of apertured brackets 43, onefor each of the pins 39, which are rigidly attached to the angle members4!, as by welding, and which have apertures 44 adapted to provide arelatively close fit with the pins 39. 5

Where the pins 39 are made perpendicular to the plane of the screensections 38, the apertures 42 may be made smaller so that said pins 39fit closely therein, under which; conditions the brackets 43 may beeliminated.

It is to be distinctly understood that the con struction of the screensections 38, illustrated in Fig. 5, and the construction of the shakingscreen 33, of said Fig. 5, may be employed as a stationary screen, asillustrated in Fig. 1. I

It is also to be distinctly understood that the stationary screen ofFig. l and the construction of said screen sections l4 of Figs, 1, 2, 3and 4 may be mounted as a shaking screen, as illustrated in Fig. 5.

In addition to the elements previously described in Fig. 5, we alsoprovide a feed chute 45 for feeding material to the shaking screen 30and two discharge chutes 43 and 41, respectively, the former of whichdischarges material from the screen 39 which does not pass throughperfora tions in the screen sections 38 and the latter of whichdischarges the material which does pass through said perforations.

illustrated" in Fig. 5 of the drawings, the perforated-bottom plates ofthe screen sections 38 are flat. This construction is by nomeansnecessa-ry and in Figs. 6, 7 and 8 we-have illustrated bottom plates 48which extend between apair of longitudinally extending side straps 4 8and are rigidly attached thereto, as by welding. Said bottom plates '48are also provided with lips 49. This lip construction is sometimespreferred for its aids the movement of the material along the screen; Itwill, of course, be evident that the screen sections M of Fig.- 4 mayalso be provided with a lip type of bottom plate in place of the flatbottom plate 23.

In Figs. 9 and 10, there is illustrated another form of screen chutewhich may either be the stationary or shaking screen type. This chutecomprises side walls 50 and the usual bottom wall similar to bottom walll9 of Fig. 1 and 32 of Fig. 5, which is not shown.

At spaced intervals along the side walls 5!], we provide transverselyextending angle members 5|. which are welded at their ends to the sidewalls 50. The top flange 52 of said angle members 5| is provided withspaced perforations 53 adapted to receive the pins 39 of the screensections 38. It may be noted that, as illustrated in Fig. 10, the pins39 are perpendicular to the plane of the screen sections 38. When thisconstruction is employed, brackets, similar to the brackets 43 of Figs.6, '7 and 8, may be omitted.

The angle members 5| have a stifiening eifect upon the side walls 50 ofthe screen which, of course, is not present in the other forms of theinvention.

The operation of the device of Fig. 5 is, in general, the sameregardless of the exact structure thereof as illustrated by the severalmodificationsin Figs. 6, 7, 8, 9 and 10, and may be briefly described asfollows:

Material, such as coal to be sized, is fed to the chute 45. The shakingscreen 30 will be oscillated from the eccentric mechanism 35 operated bymotor 36. As material is fed to said shaking screen 30, those particleswhich are smaller than the apertures in the bottom sections of thescreen 38 will pass therethrough and flow along the bottom wall 32 ofsaid shaking screen 30 to be discharged by the discharge chute 41. Thosematerial particles which are larger than the apertures in the bottomplates of screen sections 38 will pass over said screen sections 38 andbe discharged from chute 46. It will be evident that the screen sections38 will be rigidly held in place though they may be very readily removedto be replaced by other similar screen sections which may have differentsize apertures in the bottom plates thereof.

Obviously those skilled in the art may make various changes in thedetails and arrangement of parts without departing from the spirit andscope of the invention as defined by the claims hereto appended, and wewish therefore not to be restricted to the precise construction hereindisclosed.

Having thus described and shown an embodiment of our invention, what wedesire to secure by Letters Patent of the United States is:

1. In a chute, the combination with a trough having side walls, of railspositioned adjacent said side walls and extending longitudinallythereof, means for spacing and supporting said rails inwardly of saidtrough side walls comprising a plurality of equally spaced rivets, and aplurality of separately removable screen sections of'diflerent lengthsand interchangeably mounted on said trough,'each having upwardlyextending side flangesand downwardly-extending legs, said legs havingnotches received by said rivets, said sections having perforated bottomsresting' on said rails. I i i '2. In a chute, the combination with atrough having side walls, of rails positioned adjacent said side wallsand extending longitudinally thereof, means for spacing and supportingsaid rails inwardlyof said trough side walls comprising a plurality ofequally spaced rivets, and a plurality of separately removable screensections of difierent length, each having downwardly extending legs,said legs having notches received by said rivets.

3. In a chute, the combination with a trough having side walls, of arail positioned adjacent a side wall and extending longitudinallythereof, equally spaced rivets passing through said side wall and saidrail, spacing means about said rivets between said rail and side wall,and a screen section supported by said rail and having downwardlyextending legs notched and receiving said spacing means, said notchbeing of such depth that the leg portion forming the bottom thereof isout of contact with said spacing means.

4. In a chute, the combination with a trough having side walls, of arail positioned adjacent a side wall and extending longitudinallythereof, securing means adapted to pass through said side wall and saidrail, spacing means about said securing means between said rail and sidewall, and a screen section supported by said rail and having downwardlyextending legs positioned adjacent said spacing means, said legs beingconstructed and arranged so as to prevent longitudinal movement of saidscreen section relative to said trough without carrying the verticalload on said screen.

5. In a chute, the combination with a trough having side walls, of arail positioned adjacent a side wall and extending longitudinallythereof, equally spaced rivets passing through said side wall and saidrail, spacing meansabout said rivets between said rail and side wall,and a plurality of separately removable screen sections of differentlengths supported by said rails and each having downwardly extendinglegs notched and receiving said spacing means.

6. A screen section for a multiple section screen comprising aperforated metal bottom plate having upwardly extending longitudinalside flanges, and short substantially equi-length downwardly extendinglegs adjacent each end of said section and along each side thereof, saidlegs having downwardly opening retaining notches therein adapted to locksaid section;

7. A screen section for a multiple section screen comprising aperforated bottom plate having upright longitudinal side flanges, andfour downmembers; and angle clips attached to said side walls and havingapertures cooperating with said pins to prevent sliding movement betweensaid sections and said trough.

9.'In a chute, the combination with a trough having side walls, of arail positioned adjacent a side wall and extending longitudinallythereof, spaced rivets passing through said side wall and said rail,spacing means about said rivets between said rail and side wall, and ascreen section supported by said rail and having downwardly extendinglegs notched and receiving said

